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Preheat the oven to 180C/gas 4/fan 160C. If baking to cut into squares, line a 33 x 23 x 5cm baking tin with non-stick baking parchment. If serving as a pudding simply grease a similar-sized ovenproof dish with a little butter.
Melt about 15g/1⁄2oz of the butter and stir into the caster sugar, nuts and cinnamon in a bowl. Set aside.
Cream together the rest of the butter with the muscovado sugar and egg. When smooth and creamy, stir in the flour, bicarbonate of soda, 1⁄2 tsp salt and the soured cream. Lastly, stir in the rhubarb.
Pour the rhubarb mixture into the prepared tin and sprinkle with the sugar and nut topping. Bake for 30-35 minutes or until a skewer inserted in the centre comes out clean. Serve immediately as a pudding, or leave to cool and cut into squares. Keeps for 4-5 days in an airtight tin.